Create a task from an email
You can quickly create a task from any email by using More > Add to Tasks
To create a new task from an email, click on the More button which appears when you select or view an email and choose "Add to Tasks" from the drop down menu. The task you create will have a "related email" link so you can easily refer back to the email.
You can also use this method to create an Event from an email (GMail needs to recognise some calendar details - date, time etc), or you can create a Google Doc (if you switch the Create a Document lab on).